要减肥小霸王

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Frog Jump

A frog is crossing a river. The river is divided into x units and at each unit there may or may not exist a stone. The frog can jump on a stone, but it must not jump into the water.Given a list of s

2.python学习笔记——基本语法

1.标识符第一个字符必须为字母开始或者下划线_ 标识符其他组成部分可以是字母、数字、下划线 字符区分大小写_time = 1time = 11jjj = 1 #无效语法---------------------报错信息-------------------------File "<ipython-input-4-e8a26cbdf931>", ...